Define lustre. Give the lustre of diamond.
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Lustre is gentle shining light that is reflected from a surface, for example from polished metal.
The luster of Diamond is excellent. Diamond exhibits great "fire" and brilliance, which gives it a shiny, freshly polished look. Rough Diamonds exhibit a greasy luster, but proper cutting give them a powerful adamantine luster. Only synthetic substances and a few minor gemstones can reach or excel the refractive index of Diamonds.
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